%0 Journal Article
%T Computational fluid dynamics analysis on orifice structure inside valve core of pilot
%A Bu-Zhan Liu
%A Jin-Yuan Qian
%A Ming Zhang
%A Zhi-Jiang Jin
%A Zhi-Xin Gao
%J Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
%@ 2041-2983
%D 2018
%R 10.1177/0954406217721257
%X A novel pilot-control angle globe valve is proposed, and it has an obvious advantage of energy conservation during its opening and closing process. In pilot-control angle globe valve, the opening and closing forces are related to the orifice located inside the valve core. In this paper, the effects of orifice diameter are thoroughly studied under different working conditions such as valve core displacements and inlet velocities. To begin with, the numerical model is validated by comparing similar angle valves, and then the flow and loss coefficients under different orifice diameters are discussed. It is found that the effects of orifice diameter on force acting on valve core depend on valve core displacement and inlet velocity. Thus different valve core displacements and inlet velocities combined with different orifice diameters are further studied. It is also found that when the orifice diameter is larger than 12£żmm, pilot-control angle globe valve cannot be used under small inlet velocity or large valve core displacement. In addition, formulas to calculate forces on valve core are proposed for further orifice design. This work can be referred in process industries especially in a piping system with orifice plates or globe valves
%K Computational fluid dynamics
%K pilot-control angle globe valve
%K orifice
%K loss coefficient
%K valve core displacement
%K inlet velocity
%U https://journals.sagepub.com/doi/full/10.1177/0954406217721257